NCL30083BDMR2G ON Semiconductor, NCL30083BDMR2G Datasheet - Page 16

• Manufacturer Part Number: NCL30083BDMR2G
• Description: LED Lighting Drivers Step-Dimm Quasi-Res I-Mode Cntlr
• Manufacturer: ON Semiconductor

Specifications of NCL30083BDMR2G

• Rohs: yes
• Input Voltage: 18 V
• Operating Frequency: 65 kHz
• Maximum Supply Current: 1.2 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: Micro-8
• Minimum Operating Temperature: - 40 C

operating in quasi−resonant mode. Thanks to proprietary
circuitry, the controller is able to accurately regulate the
secondary side current of the flyback converter without
using any opto−coupler or measuring directly the secondary
side current.
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The NCL30083 implements a current−mode architecture
0.906
0.904
0.902
0.900
0.898
0.896
Quasi−Resonance Current−Mode Operation:
implementing quasi−resonance operation in peak
current−mode control, the NCL30083 optimizes the
efficiency by switching in the valley of the MOSFET
drain−source voltage. Thanks to a smart control
algorithm, the controller locks−out in a selected valley
and remains locked until the input voltage or the output
current set point significantly changes.
Primary Side Constant Current Control: thanks to a
proprietary circuit, the controller is able to take into
account the effect of the leakage inductance of the
transformer and allow accurate control of the secondary
side current.
Line Feed−forward: compensation for possible
variation of the output current caused by system slew
rate variation.
Open LED protection: if the voltage on the VCC pin
exceeds an internal limit, the controller shuts down and
waits 4 seconds before restarting pulsing.
Thermal Fold−back / Over Temperature / Over
Voltage Protection: by combining a dual threshold on
the SD pin, the controller allows the direct connection
of an NTC to ground plus a Zener diode to a monitored
voltage. The temperature is monitored and the output
current is linearly reduced in the event that the
temperature exceeds a prescribed level. If the
−40
Figure 51. V
−20
T
J
, JUNCTION TEMPERATURE (°C)
0
BO(off)
20
vs. Junction Temperature
40
60
TYPICAL CHARACTERISTICS
APPLICATION INFORMATION
80
100
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56.0
55.5
55.0
54.5
54.0
53.5
53.0
52.5
temperature continues to increase, the current will be
further reduced until the controller is stopped. The
control will automatically restart if the temperature is
reduced. This pin can implement a programmable OVP
shutdown that can also auto−restart the device.
Brown−Out: the controller includes a brown−out
circuit which safely stops the controller in case the
input voltage is too low. The device will automatically
restart if the line recovers.
Cycle−by−cycle peak current limit: when the current
sense voltage exceeds the internal threshold V
MOSFET is turned off for the rest of the switching
cycle.
Winding Short−Circuit Protection: an additional
comparator with a short LEB filter (t
signal and stops the controller if V
V
enabled only during the main LEB duration t
Output Short−circuit protection: If a very low
voltage is applied on ZCD pin for 90 ms (nominal), the
controllers assume that the output or the ZCD pin is
shorted to ground and enters shutdown. The
auto−restart version (B suffix) waits 4 seconds, then the
controller restarts switching. In the latched version (A
suffix), the controller is latched as long as V
above the V
Soft−start: The soft−start pin can be used to slowly
increase the output current at startup and provide a
smooth turn−on of the LED light.
Step dimming: Each time the IC detects a brown−out
condition, the output current is decreased by discrete
steps.
ILIM
−40
. For noise immunity reasons, this comparator is
−20
Figure 52. t
CC(reset)
T
J
, JUNCTION TEMPERATURE (°C)
0
threshold.
20
Temperature
BO(BLANK)
40
60
vs. Junction
CS
BCS
reaches 1.5 x
80
) senses the CS
CC
LEB
100
ILIM
stays
.
, the
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